package com.itheima.finaldemo;

public class Demo01 {


}

    final class A{
    public  void sing(){}
    public final void sing2(){}
    public final void sing3(){}
    public final void sing4(){}
}
// 被final 修饰的类不能被继承  不能成为一个父类
/*class B extends A{

}*/

